Reznor YDSA Unit Installation Manual - Manual (Page 60)

Form I-Y, P/N 273646R6, Page 60
 Check that combustion air inlet and flue discharge openings are free of
obstructions.
 If installed in California, verify that the California Warning Label is displayed. See
Paragraph 1.4.
 If equipped with a high-efficiency gas heat section, verify that the condensate drain
is installed. See Paragraph 9.2, starting on page 37.
Function Key Displays The function keys will be referred to throughout the following procedures. The unit con-
troller display or the optional remote display may be used. The function key symbols for
Alarm, Prg, and Esc differ on the remote display. See examples below for clarification.
10.3 Unit Test Mode
and Setting
Fan CFM
Test Mode Instructions
The test mode is accessed via the service menu and can only be entered when the unit
is in the OFF state. Once the test mode is enabled, it remains active for a 2-hour time
period adjustable from 0 to 4 hours. When the timer expires or test mode is disabled,
the unit will return to the OFF state.
In the Test Mode, all sequences of operation stop. Upon the Test Mode being enabled,
the following devices shall be automatically commanded:
1. The Unit Damper Position Y1 shall be automatically commanded to = 100%.
2. The Unit Supply Fan NO1 will be automatically commanded ON.
3. The optional unit Exhaust Fan will be automatically commanded ON via modbus.
4. The Unit Supply Fan Speed Y2 and optional unit Exhaust fan via modbus
communication will be automatically commanded to their maximum Speed %
setpoint values. (The maximum Fan Speed % setpoint values are initially set at the
factory and will need to be verified in the field.)
Once supply airflow is proven via Unit Supply Fan Status ID1, the user can manu-
ally select all of the remaining controller outputs to be commanded ON and OFF or
modulated between 0-100% with the exceptions shown in the Compressor Test State
Automatic Interlock Table.
Output Terminal Output Point Name Output Description Interlocked Output
Y3 Comp_Mod_Cap DX Capacity Modulation
Condenser Fan Section A NO5 = ON When
Y3 greater than 1.44 vdc
NO2 Compressor_Stg2 DX Compressor Stage 2 Start/Stop Condenser Fan Section B NO6 = ON
NO3 Compressor_Stg3 DX Compressor Stage 3 Start/Stop Condenser Fan Section B NO6 = ON
NO4 Compressor_Stg4 DX Compressor Stage 4 Start/Stop Condenser Fan Section B NO6 = ON
Compressor Test State Automatic Interlock Table
Example of Unit Controller Display Key
Symbols
Example of Remote Controller Display (Option
RB5 or RB6) Key Symbols
Function Key Identification Alarm Prg Esc Up Enter Down
Function Key Display on the
System Controller
Function Key Display on the
Remote Controller
10.0 Commissioning and Startup (cont’d)
10.2 Checklist
Prior to Startup
(cont’d)
10.2.2 Additional Gas Heat Checklist Prior to Startup (cont’d)